The normal definition of a “dog’s breakfast” is a jumble, a SNAFU, a mixture of the unknown, disgusting, and the barely identifiable; it is intended to refer to a pile of vomit and/or garbage.
I was thinking of 'dingo's breakfast' - from the Dinkum Aussie Dictionary:
Dingo's breakfast : a yawn, a leak and a good look round (i.e. no breakfast)